Mold-making machine.



E. S. CARMAN.

MOLD MAKING MACHINE.

APPLICATION FILED APR.25,1913.

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E. S. CARMAN.

MO-LD MAKING MACHINE.

APPLICATION FILED APR. 25, 1913.

Patented Mar. 27, 1917.

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MOLD MAKINGMACHINE.

APPLICATION FILED APR. 25, 1913. Q35, Patented Mar. 27, 1917.

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MOLD .MAKING' MACHINE. 7 v KPPLICATION FILED APR-25,1913. N

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1-; rarnivr o ti EDWIN S. CARIVIAN, F CLEVELAND, OHIO, ASSIGNOR TO THEOSBORN MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A GOR'PURATION OFOHIO.

MOLD-MAKING MACHINE.

Specification of Letters Patent.

Patented Mar. 2'7, 1917.

Application filed April 25, 1913. Serial No. 763,563.

To all whom it may concern Be it known that I, EDWIN S. CARMAN, acitizen of the United States, and a resident of Cleveland, county ofCuyahoga, andState of Ohio, have invented a new and useful Improvementin Mold-Making Machines, of which the following is a specification, theprinciple of the invention being herein explained and the best mode inwhich I have contemplated applying that principle, so as to distinguishit from other inventions.

The present invention belongs to that class of mold making machines inwhich the frame that carries the pattern plate is oscillatory about asubstantially central axis, whence the name roll-over given suchmachines in the trade. The object of the invention is the provision, incombination with a machine of this kind, of combined jarring and patterndrawing means, so that the operations of packing and jolting the sand inthe box, inverting such box, lowering the same, and then drawing thepattern, may be easily performed and with a minimum of time and labor.Another object is to provide a machine of the class referred to, whichwill be readily adjustable to receive pattern-plates of various sizeswithin a considerable range. lPhe invention, furthermore, comprises improvements in various details, including the combined jolting anddrawing mechanism, in the control valve for actuating such mechanism, inthe holders for the pattern plate, and in the leveling table whichreceives the completed mold. To the accomplishment of the foregoing andrelated ends, said invention, then, consists of the means hereinafterfully described and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however, but one of the various mechanical forms in whichthe principle of the invention may be used.

In said annexed drawings Figure l is a plan view of a machine embodyingthe present improvements; Fig. 2 is a front elevational view of thesame; Fig. 3 is an end elevation thereof; Fig. 4: is a centraltransverse cross-section taken on the plane indicated by the lines 4- 1in Figs. 1 and 2, respectively; Fig. is a central'longitudinalcross-section of the machine, as indicated by the lines 5 5 in Figs. 1and 3, respectively; Fig, 6 illustrates in elevation the contactingfaces of two complementary elements of a trunnion bearing forming afeature of the invention; Figs. 7 and 8 are sectional views ofcylinder-and-piston mechanism forming another feature, the plane of thesection being the same as in Fig. 4, but the parts being shown in twodifferent operative positions, respectively; Figs. 9 and 10 aresectional views of said cylinder-andpiston, the plane of the sectionbeing the same as in Fig.5, and the positions of the parts correspondingwith those shown in Figs. 7 and 8, respectively; Figs. 11 and 12 aresectional views of details of the leveling table, asindicated by lines11l1 and 1212, Figs. at and 5, respectively; Fig. 13 is a plan view, ona larger scale than in Fig. 1, of a control valve for thecylinder-andpiston mechanism; Fig.14: is a section on the line l414l inFig. 18, but with the handle disposed in the position marked Jolt; Fig.14: is a central vertical section through the valve and handle when thelatter is in the neutral position; Figs. 15, 16 and 17 are transversesections of said valve all taken on the same plane, viz., that indicatedby the line a e, Fig. 1 1, but showing the parts in different operativepositions respectively; Figs. 18, 19 and 20 are similar transversesections of said valve, with parts correspondingly disposed, taken onthe plane indicated by the line Z)b, Fig. 14; and Fig. 21 is a verticalsection of a detail taken at right angles to the plane of the section ofFig. 14.

The frame of the machine, which supports the various operative parts, isof general rectangular form, comprising end members or standards 1connected at their lower ends by a base 2 formed laterally with plates3, one on each side, extending some distance above the floor line. Saidstandards are joined at their upper ends'by two bars 1-, likewisedisposed one on each side. Located midway between the end members of theframe is a stationary piston 5 on which is reciprocably fitted aninverted cylinder 6, the upper end of which has integrally formedtherewith, or rigidly attached thereto, as most convenient, alongitudinally extending cross head 7 The latter is of inverted V-shapein cross-section and forms a sliding support for two brackets 8, whichare designed to carry the pattern plate at their upper ends. Themovement of the cross head thus carried by the reciprocable cylinder issteadied by means of guide pins 9, one on each end, which are secured attheir upper and lower ends in the corresponding end members 1 of .theframe and project upwardly through snugfitting apertures in the endsof'said cross head.

' The two brackets S are designed to be symmetrically disposed at alltimes with respect to the central transverse plane of the maplates 12,moreover, are fitted, one on each side of the pistonand-cylindermechanism, so as to substantially inclose the space betweenfsuch'cross-head inits lower position and the side walls 3 of the base. Thesand that may drop from above is accordingly not only prevented fromaccumulating on the cross-head'support, but is diverted to either side,entirely free of the machine frame.

As has been indicated, theupper ends of the two brackets 8 are designedto holdor carry the pattern-plate, as also the mold box, when the latteris attached to such plate,

- as will be the case in the actual operation of the machine while suchmold box is being filled and inverted. The pattern-plate carrying meanscomprise two end bars or strips 18 removably attached to the inner facesof two'disk-like members 14 secured by means of pins 15 to central boresin complementary disk-like members 16, that form the upper ends of saidbrackets 8. (See Fig. The

pattern plate, shown in dotted outline only in the drawings, is designedto be held between thetwo transverse bars 13, the latter being selectedof the proper length to suit the width of said plate, and the brackets 8themselves being adjusted longitudinally of the supporting cross-head tovary the space between these bars to suit the length of suchpattern-plate, as will be readily understood.

As shown in Fig. 6, the disk members 16 are circularly recessed, and theother complementary members 14 are formed with a corresponding circularprojection 17 such projection and recess being provided at dia-.metrically opposite points, respectively, with raised faces or lugs 18and 19 of limited ex tent which are adapted to have closefitting orbearing contact with each other when the two disks are properly disposedabout their axes, viz., when the pattern plate is supported inhorizontal position either face up or face down.

In such position it will be observed the weight of the pattern plate, asalso of the mold box and the contents of the latter which are suspendedfrom such pattern plate, is taken off the trunnion pins to a largeextent by these contacting faces of the disks. As soon, however, as thepattern plate is swung to one side a trifle from the position thusdescribed, these faces cease to be in engagement, and the furtherturning movement occurs with only the friction of the pins in theirbearings to be overcome. By virtue of the foregoing arrangement, it willbe seen that in the position which the pattern plate will occupy when itis being jarred, the strain or shock of such jarring is taken off thetrunnion bearings and sustained by the contacting faces of the disks;whereas for the turning over movement the increased friction, whichwould be involved, were the bearings between such disks to extend forthe full 360 degrees, is eliminated, and the rolling over of the patternplate and mold box rendered correspondingly easy.

For the purpose of locking the pattern plate in either its normal orinverted position, a locking bolt or pin 20 is provided in one of thebrackets 8, such pin tending normally to engage one or the other of twoapertures 24: in the adjacent disk member under the influence of acompression spring 21. A handled lever 22 on the end of said pin,however, co-acts with a circular cam face 23, so that by rotating saidlever in the one direction, the pin is withdrawn from such engagement,leaving the pattern plate free to be rolled over; whereupon it may belocked in its reversed position by swinging the lever back again to itsinitial position.

Centrally supported upon the two bars 4,

which connect the upper ends of the end standards 1, is the levelingtable 25, the general construction of which is the same as that shown inthe pending application of Harry R. Atwater, filed May 19, 1910, SerialNo. 562,165. In other words, said table consists of a spider-like framehaving four arms, in the ends of which are mounted independentlydepressible members, consisting specifically of pins 26, which normallyproject some distance above the frame under the influence of compressionsprings '27, as shown in Fig. 11. Disposed to coact each with a pair ofsuch pins, are two bars 28 of general U-shape, the bent or curvedportions of which lie one on each side of the center of the table so asto be engaged by the corresponding faces of a rotatable disk cam 29,while their ends lie in adjacent position to the aforesaid depressiblepins. When the cam 29 is operated, by means of a lever 30 provided forthe purpose, to force these bent bars outwardly, their ends frictionallyengage the pins with sufiicient force to lock the same in whateverposition they may chance to be. The upper ends of the pins are slottedtransversely of the longitudinal axis of the machine, and, disposed soas to slidably lie in such slots, are two bars 31, the front ends ofwhich are bent downwardly to form handles 32, while the rear ends areheld against dislodgment from the corresponding pins by means oflongitudinal recesses 33 formed in the bars through which pass rivets 3ain the slotted ends of the pins.

In the operationof the machine, when the pattern plate, together withthe mold box attached thereto, are in the position shown in Figs. 4: and5, the pattern plate will be lowered until such mold box rests on thetable just described. The bars 31 will thus be brought into contact withthe bottom board of the mold box, the pins 26 being independentlydepressed the proper amount to perfectly accommodate the bars to theinequalities in such bottom. When this adjustment has occurred, thelever is actuated to look the pins, and thus the bars, in set position.Thei'eupon the mold box may be released from the pattern plate with theassurance that no distortion of such mold box or its contents willoccur, such as might otherwise interfere with the smooth withdrawal ofthe pattern from the sand in said box.

Turning now to the detailed construction of the piston and cylindermeans which have only been incidentally referred to heretofore as theagency whereby the jolting of the mold box and its contents is securedwhen attached to the pattern plate, and whereby such pattern plate,either alone or with the mold box may be lowered or raised in thedrawing operation, especial attention is called to Figs. 4, 7 and 8, andto Figs. 5, 9 and 10, which show in sectional form and in variouspositions the aforesaid piston and cylinder. It will be noted that theposition of parts is the same in Figs. l and 5, 7 and 9, and 8 and 10 ofthe foregoing series, the difference in such paired figures consistingin the planes of the sections, which are substantially at right anglesto each other.

in the normal down position of the cylinder 6, its lower open end restson the annular base of the piston 5, such base serving as an anvil toproduce a jolting effect when said cylinder is allowed to seat suddenlyby the exhaust of the air supplied under pressure to its interior abovethe end of the piston. Such air under pressure is adapted to be thussupplied through an inlet pipe 36 leading from a suitable source andcontrolled by a suitable valve as will be presently described, while theexhaust occurs through an outlet pipe 87, which is likewise controlledby a suitable valve, in order to produce various operative effects inthe cylinder-and-piston mechanism.

The piston is centrally cored out to receive a piston valve 38, theupper end of which is secured in the closed end of the cylinder, so asto'be capable of a limited reciprocable movement relatively thereto,within a cap 39 that closes said cylinder end. This piston valve,incidentally to its movement with the cylinder and to that which it hasindependently of said cylinder, serves to control the admission andexhaust of the compressed air to produce either a jolting effect, whenthat is desired, or a straight up-anddown movement of the cylinder, whenthat is de sired.

The different positions of the valve incidentally to the productionthese several effects is shown in Figs. 4, 7 and 8 and in Figs. 5, 9 and10 respectively, as has been previously indicated. In the first of eachof the two'series of figures just named, the valve, as well as thecylinder, is shown in its lowermost position in which the exhaust portd0 in the piston is closed, but the air inlet port all. is opened. If,accordingly, air under pressure be supplied through the inlet pipe 86,and the outlet pipe 37 at the same time be open, such air under pressurewill enter the annular space left by the reduced section of the" valveat 4-2,

whence it is admitted by way of port as i into a passage i l thatextends longitudi nally of the piston to the upper end of the same, andthere is effective to raise the cylinder. The valve 38, of course, willbe carried along with the cylinder, and the conjoint upward movement ofthe two continues until the exhaust port d0 has been opened, suchexhaust port communicating with the same passage 44, whereby air waspreviously admitted to the upper-end of the cylinder, the air supplythrough port l3 being simultaneously shut off. 7 (See Figs. 7 and 9 whenthe exhaust port is just being uncovered by said valve.)

Following this position of the valve, the upper end of a by-pass 45 isuncovered by the valve, the lower end of such by-pass ing incommunication with the space left by the restricted portion 42 of thevalve, to which air under pressure is still admitted. The effect-"ofsuch by-passing of the air is to lift the valve relatively to thecylinder, an annular shoulder at on the valve serving as a piston. Thismovement of the valve is a quick one and serves to raise it to theposition shown in Figs. 8 and 10; before such movement is consummated,however, the supthe upward movement of the valve is like wise arrested,and so cylinder and valve descend until the end of the former strikesthe base 35.

l The 'port 47 in the valve is closed again betorerthe valve resumes itslowestposition peated, thereby giving rise to a more or less rapidseries of jolts or shocks to the cylinder as it repeatedly'strikes thebase on its descending movement.

When it is desired to impart to the cylinder and parts sulpportedthereby a continuous movement, instead of the jolting one justdescribed, it is merely necessary to shut off the exhaust or outlet pipeor to supply air under pressure thereto at the same time that air isthus supplied to the inlet pipe, proper. The cylinder, in this way, maybe raised until the cross-head reaches its upper limiting position onits guides, it being understood that the piston valve in the piston isin the full up position shown in Figs. 8 and 10. Upon relieving the airpressure under the cylinder gradually, the reversal of suchcylhinder-movement results, the cross-head gently settling down to itsnormal position.

It has already been explained that a single valve is utilized to controlthe operation of the cylinder-and-piston mechanism which fas has justbeen described. This valve, as will clearly appear from an explanationof Figs. 1, 2 and3, is disposed at one end of the machine at aconvenient height to be reached by the operator. The valve is of theplug type, and with the casing 52 of the valve are connected both theair inlet pipe 36 of the aforesaid cylinder-and-piston -me'chanism, andthe outlet pipe 37. There is also connected with the valve casing an oilsupply pipe 53, whereby proper quantities of oil may from time to timebe injected into the cylinder-and-piston mechanism for the purpose oflubricating the latter.

Thevalve proper, or plug 54, is provided with a number of passagesadapted to variously connect the openings of such air inlet, air outlet,and oil supply pipes in the casing with each other, or with an airsupply connection 55 and a connection 56 opening to atmosphere, whichare formed in the casing, the relative positions of said openings beingbest shown'in Figs. 13 and 14:. The plug of the valve is kept seated bymeans of a compression spring 59 in the lower end of the casing and maybe rotated to occupy any one of three angular positions in the casing bymeans of a handle 57, a spring-pressed latch 58 serving to retain thehandle and can pass to the inlet pipe 36, but on the contrary, thelatter is connected by means of the port 68, the vertical passage 60 inthe valve, the transverse passage 61, central longitudinal passage 62,and a second transverse passage 63, with a recess or channel 64 in theinner wall of the casing, that communicates with the opening 56 toatmosphere (see Fig. 2.1). As a result, in this position of the valveparts, no air remains under pressure in the cylinder-and-pistonmechanism, and the cylinder rests dead in its lower position.

When it is desired to jolt said cylinder, this requiring that the airinlet and outlet pipes be respectively connected with the air supply andwith the atmosphere, the handle of the valve is turned in a counterclockwise direction, as viewed in Fig. 13, thereby positioning the valveplug as shown in Figs. 14, 15 and 18. In such position the air supplypipe is directly connected with the air inlet pipe 36 by means of atransverse port or passage 65in the valve, while the air outlet pipe 37is similarly directly connected with the atmosphere by another largerpassage 66 in said valve.

To position the valve for elevating the pattern plate and attached moldbox preparatory to rolling the same over, or for drawing the patternfrom the mold, it is necessary, as previously explained, that theexhaust or air outlet connection 37 from the cylinder-and-pistonmechanism be closed, while air is simultaneously supplied to suchmechanism through the air inlet pipe 36. This is effected by turning thehandle in a clockwise direction from the position indicated in Fig. 13,whereby port 67 in the valve is placed in register with said pipe 36,said port being connected through passage 61 and the longitudinalchamber 60 with the central passage 62 in said valve, which latter inturn has communication with the transverse port 65, by a passage 70(shown only in Fig. 14). In the position of the handle in question, thisport 65, as shown in Fig. 17, registers with air supply connection 55,thus admitting air under pressure, through the passages and parts justnamed to the air inlet pipe 36 of the pistonand-cylinder mechanism. Atthe Cir same time that the foregoing connection is effected, allcommunication through the valve between the air outlet pipe andatmosphere is shut off, as shown in Fig. 20.

The supply of air, in the position of the valve part, shown in Fig. 17,is adapted to be regulated by means of a needle valve 72, which isalined with the passage 62 so as to more or less completely shut 0d thepassage 61 connecting the same with the chamber 60. The stem of thisneedle valve extends beyond the smaller end of the valve where oilsupply pipe 53. The small quantity of oil which accumulates in suchpassage, whenever the valve is in this position, is carried along withthe air when the valve is turned into the position shown in Figs. 17 and18 for raising the cylinder and the pattern plate carried thereby.

It will thus be seen that the oil designed to lubricate the cylinder andpistonmechanism is supplied to the latter when the valve of suchmechanism as well as the cylinder and piston proper are in their fullraised positions, thus insuring the thorough lubrication of all themoving parts in said mechanism.

Having thus described the various cooperative parts of my improvedmachine and their individual operation, the general mode of using themachine may be briefly set forth. With the parts in position illustratedin Figs. 1, 2 and 3, the brackets 8 being adjusted and the bars 13at-the upper ends of said brackets being selected to accommodate thedesired pattern plate, a suitable mold box will be attached to suchpattern plate and filled with sand which may be preliminarily tampeddown, if desired, but which is finally packed about the pattern plate byproperly turning the lever of the controlling valve to admit air intothe piston and cylinder mechanism so as to cause the cylinder to riseand fall in rapid succession, thereby j citing the mold box and itscontents. Such jolting may be repeated if necessary after more sand hasbeen added. When the box is finally full, the bottom board is placed onsuch box and board and box securely clamped to the pattern plate. Thevalve lever is now turned in the opposite direction so as to admit asteady supply of air for lifting the cylinder and the parts supportedthereby. In this Way the pattern plate and mold box are elevated to asuflicient height to admit such pattern plate to be turned completelyover, the locking pin being first withdrawn and then inserted to lockthe plate in its new position. Thereupon lowering the cylinder thepattern plate, mold box and bottom board are likewise lowered until thelatter rests upon the leveling table, the depressible members on thelatter automatically attaching themselves to such bottom are locked, andthe mold box thereupon unclamped from the pattern plate. Air is thenagain admitted to raise the cylinder and thereby withdraw the patternplate from the mold or sand in the box. As soon as the pattern plate isclear of the mold box, the latter is removed from the machine by pullingon the bars, and then either lifting the box bodily with the hands orattaching thereto a suitable crane or other mechanical lifting device.The pattern plate is now reversed to its normal position ready toreceive a fresh mold box, and the operation proceeds as before.

It will be seen from the foregoing that a number of advantageousfeatures are incorporated in the present improved machine. Not only isthe machinereadily adjustable to cover a considerable range of work, butby utilizing a single mechanism for both the jolting of the mold box andthe drawing of the pattern therefrom, both the mechanism is simplifiedand the operation much expedited. In fact by simply turning the leverthat controls the valve, the whole op eration of themachine issubstantially accomplished, save for the attaching of the mold box tothe pattern plate, the shoveling in of the sand, and the inverting ofthe pattern plate and the mold box. The advantages of the severaldetails of construction to which attention has hereinbefore been calledneed not be further dwelt upon.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, pro vided the means stated by any of the followingclaims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as myinvention 1. In mechanism of the character de scribed, the combinationwith a frame; of a 1:;

mechanism adapted to reciprocate cross-head; brackets mounted on andadjustable along said cross-head; and a double screw rotatably held insaid cross-head and adapted simultaneously to adjust said brackets in orout.

3. In mechanism of the character described, the combination of a frame;of a cross-head reciprocable in said frame; said cross-head; bracketssupported in said crosshead; a pattern-plate carrier oscillatorilymounted on said brackets; and a leveling table located between saidcross-head and said carrier.

4; In mechanism of the character described, the combination of a frame;of a cross-head reciprocable in said frame; mechanism adapted toreciprocate said cross-head; brackets mounted on and adjustable alongsaid cross-head; means adapted simultaneously to adjust said brackets inor out; and a pattern-plate carrier oscillatorily mounted on saidbrackets.

5. In mechanism of the character described, the combination of a frame;of a cross-head reciprocable in said frame; mechanism adapted toreciprocate said cross-head; brackets mounted on and adjustable alongsaid cross-head; means adapted simultaneously to adjust said brackets inor out; a pattern-plate carrier oscillatorily mounted on said brackets;and a leveling table located between said crosshead and said carrier.

6. In mechanism of the class described, the combination-with a frame; across-head reciprocable in said frame, said cross-head having its upperface convex in transverse section; mechanism adapted to reciprocate saidcross-head; two brackets slidably rest ing on the upper face of saidcross-head; and means adapted to move said brackets in or out.

7. In mechanism of the class described, the combination with a frame; across-head reciprocable in said frame, said cross-head having its upperface convex in transverse section; mechanism adapted to reciprocatesaid'cross-head; two brackets slidably resting on the upper face of saidcross-head: and means adapted to simultaneously move both brackets: in@or out, said means includ ing a double screw'secured to the under sideof said cross-head and having threaded-engagement with said brackets. I

a 8. I11 mechanism of the character described, the combination with aframe and a cross-head vertically reciprocable therein; of spacedbrackets mounted on said crosshead; a pattern plate carrier; bearings insaid brackets, said pattern plate carrier be ing oscillatorilysupported'on said bearings; and auxiliary bearing surfaces on saidcarrier and brackets, said auxiliary bearings being operative in certainpositions only of said carrier.

9. In mechanism of the character described, the combination with a frameand a cross-head vertically reciprocable therein; of spaced bracketsmounted on said crosshead; a pattern plate carrier; trunnion bearings insaid brackets adapted to oscillatorily support said pattern platecarrier thereon; and additional complementary bearing surfaces formed onsaid brackets and carrier and adapted to be in operative. contact incertain positions only of said carrier.

10. In mechanism of the character described, the combination with aframe and a cross-head vertically reciprocable therein; of spacedbrackets mounted on said crosshead; a pattern plate carrier; trunnionbearings in said brackets adaptedto oscillatorily support said patternplate carrier thereon; additional bearing surfaces formed on saidbrackets above and below said trunnion bearings; and means on saidcarrier adapted to contact such additional bearing surfaces in oneposition only of said carrier.

11. In mechanism of the class described, the combination with a frame;of a vertically reciprocable carrier; a pattern-plate; and means forpivotally attaching said plate to said carrier, said means comprisingtwo spaced brackets secured to the carrier and movable toward and fromeach other, two rotatable members secured to the respective brackets onhorizontal axes, and two bars removably secured to the respectiverotatable members and adapted to hold the pattern-plate.

12. In mechanism of the class described, the combination with a frame;of a vertically reciprocable carrier; a pattern-plate; and means forpivotally attaching said plate to said carrier, said means comprisingtwo spaced brackets secured to the carrier, and movable toward and fromeach other, said brackets being provided with recessed disks facing eachother and the disks having diametrically opposite lugs, two rotatablemembers secured to the respective disks on horizontal axes with theirfaces loosely fitting in the recesses of the disks, the members havingdiametrically opposite lugs adapted to bear face to face with the lugson the disks when the members are in one rotative position, and twobars, removably secured to the respective rotatable members and adaptedto hold the pattern-plate.

Signed by me this 24th day of April,

EDWIN S. CARMAN. Attested by ROBERT M. SEE, ANNA L. GILL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

